There are third-party tools available that claim to reset BIOS passwords. However, be cautious when using these tools, as they can potentially damage your computer or violate its warranty.
The HP EliteBook 840 G3’s BIOS password is (removing the battery does nothing—a common myth). It’s stored in flash memory that retains data for 20+ years without power. How To Reset Bios Password Hp Elitebook 840 G3
However, HP has a backdoor. Like many manufacturers, HP generates a unique based on the "System Number" or "System ID" displayed on the locked screen. There are third-party tools available that claim to